Grid device



C. HERZOG April 25, 1944.

GRID DEVICE Filed Oct. 5, 1943 2 Sheets-Sheet l April 25, 1944.

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basa/177077.

Patented Apr. 25, 1944 UNITED STATES PATENT OFFICE GRID DEVICE Carl Herzog, Belleville, N.

` Application october 5, 1943, serial No. 505,061

(ci. 25o-m5) 13 Claims.`

The present invention relates to a grid device for radioy tubes or the like.

An important object of the inventionis to provide simple and reliable means for locking the grid side rod or rods with the insulating disc, against axially movement in both direcciated parts.

A further object of the invention is to provide locking means of the above mentioned character which will eliminate the stacking of the side rod or rods or the welding of separate wire sto-ps to the same.

Other objects and advantages of the invention will be apparent during the course ofthe following description.

In the accompanying drawings forming a part of this application and in vwhich like` numerals 'are employed to designate like parts throughout the same, l

Figure 1 is a central vertical longitudinal section through a grid device embodying my invention, parts being shown in elevation,`

Figure 2 is the plan View of same,

Figure 3 is a central vertical section,k upon an enlarged scale, through the bottom disc `and associated elements,

Figure 4 is a horizontal section taken on line 4-4 Figure 3,

Figure 4 is a central Vertical section through a lower disc and associated elements, showing a modication of the invention,

Figure 5 is a vertical section through a modied form of grid device embodying my"inven` tion, taken 0n line 5--5 of Figure 6,

Figure 6 is a plan View of the same, l

Figure 7 is a horizontal section taken on line 1-1 of Figure 5, and,

Figure 8 is an exploded perspective view of the lower locking disc' and associated elements, parts broken away.

The rst form of `the invention is shownin Figures 1 to 4 inclusive. In this form o'f,the invention a plurality of grid units arefshown.

Each grid unit vcomprises apairoi upstanding grid side rods Ill, formed of metal, having secured thereto by welding or the like a grid element or grid Wire II. The grid elements or `wires II `arepreferably circular or spiral and the grid units are arranged in spaced concentric relation. The grid side rods I0 are provided near formed of mica or the like. This insulating disc has pairs of openings I5 to receive the pairs of grid side rods I0, which preferably have a sliding t within these openings. The pairs of openings I5 have the same center distances as the normal center distances of the grid side rods I0. The insulating disc I4 has a central opening I6 to slideably receive the upper end of the cathode sleeve I2.

Arranged near the lower ends of the pairs o grid side rods IIJ is an inner insulating disc I1, formed of mica or the like. This insulating disc has pairs of openings I8 to receive the pairs of grid side rods, and the center distances of the pairs ofopenings I8 .is less than the center distances of the pairs of side rods. The insulating disc I1 has a central opening I8 to receive the lower end of the cathode sleeve I2 and the stops I3 are disposed adjacent to the discs i4 and I1. Arranged beneath and contacting with the lower face of the disc I1 is an outer insulating disc I9, formed of mica or the like, and this insulating disc has pairs of openings 2|J`to receive the pairs of grid side rods and the pairs of openings 20 have the same center distances as the pairs of grid side rods which they receive. The disc I9 is provided centrally thereof with an opening 2| to receive the lower end ofthe cathodesleeve I2, as shown.

A shield is provided for the upper insulating disc I4, which is preferably formed of metal. This shield includes a discZI, having pairs of openings 22,`throughrwrhich the pairs of grid side rods pass. The openings 22are of larger diameter than the side rods so that the shield is insulated.v from the side rods. Thedisc-2l has `acentral opening 22 to receive the cathode sleeve I2, and this opening is `larger in diameter than the cathode sleeverto insulate the same. The shieldV has a marginal annular flange 23, receiving the periphery of thedisc I4 and extending belovsI the same. The ange 23 has tabs 23a which are bent over the lower face of the disc 24. These tabs carry extensions 23'.

Numeral 24 designates a lower shield, preferably formed of metal, arranged beneath and in contact with the disc I'I, and having pairs of openings 25, to receive the pairs of grid side rods I8 and these openings are of larger diameter than the-side rods so that the side rods are insulated from the disc 24. The disc 24 has a central opening 24 to receive the cathode sleeve I2 and this opening is larger in diameter than the sleeve I2, to insulate it. The shield 24 has an annular flange 26, receiving the peripheries of the discs II and I9, and has tabs 21 bent over the upper face of the disc I'I, and carrying eX- tensions 2l. v

The numeral 28 designates a pair of mounting side rods, extending through openings 29 in the disc I4, openings 29 in the disc 2|, Openings 38 in the disc I1, openings 3I in the disc I8, and openings 3 I in the disc 24.

In assembling the device, the outer pair of grid side rods Ill is brought into proximity to the outer pair of openings I8 and pressed inwardly so that their normal center distance is reduced to that of the outer pair of openings I8. The lower ends of the outer pair of grid side rods I8 are then inserted into the outer pair of openings I8, subsequently to which the pressure is relieved upon the outer pair of grid side rods and they expand to their normal center distance, as the grid wire is resilient, and the notches I will receive portions of the disc I'I adjacent to the openings I8. In a similar manner, the inner pair of grid side rods are introduced into the inner pair of openings I8 and subsequently locked to the disc I'I. The cathode sleeve I2 has its lower end passed into the opening I8 and the mounting side rods 28 have their lower ends passed into the openings 30. The outerdiscl 9'is nowplaced upon'the'disc I'I and its pairs of openings 20 receive the pairs of ygrid side rods, since the pairs of openings 20 'have the same center distances as the ynormal center distances of the grid side rods. The other openings in the disc I9 receive the ends of the sleeve I2 and the mounting side rods. The disc 24 is now applied to the disc yI9 andthe disc I1. The upper yinsulating disc VI4 is now applied to the upper ends of the pairs of grid side rods andthese side rods extend through the openings I5 since the pairs of openings I5 have the same center distances as the normal center distances of the pairs of grid side rods. The sleeve vI2 and mounting side rods 28 pass through the other openings in the disc I 4, The disc 2|- is appliedto the disc I4 andthe naps 23a are bent over the inner face of the disc I4, The extensions 23 and 21' are now welded to the rods 28.

-From the foregoing description it will be seen that the notches I0 lock the pairs of grid side rods to thelower disc I'I against axial movement, adjacent to vtheir lower ends, while the disc I9 holds `these pairs of grid'side rods against lateral'movement with relation tothe disc I'I. The pairs of grid side rods are therefore securely locked against axial and lateral movements adjacent lto their lower ends, while the disc I4 holds them against lateral displacement near their upper ends, but permits of the sliding movement of the upper ends of the grid side rods within the openings I5, due to the expansion and contraction of the same.

I contemplate omitting the insulating disc I8, and relying upon the stiffness of `the grid wires to hold the grid Vsiderods inthe normal center `tabs 21 are bent over the positions. A disc 24'a corresponding to the disc 24 is applied to the disc I'I, Figure 4. All other parts of the device remain identical with those shown and described in connection with the first form of the invention.

In Figures 5 to 8 inclusive, I have shown a modified form of the invention. The same grid units are shown including the pairs of grid side rods I0, the same cathode sleeve I2 is used except that thetwo stops I3 are disposed near the lower end of the sleeve I 2, and the same `mounting side rods 28 are used.

In this form of the invention, an upper insulating disc 32 is provided, formed of mica or the like. This disc is cut generally diametrically into two -segments 33 and 34, the segment 33 being slightly larger. The segment 33 has pairs of openings or notches 35 formed therein, slideably receiving the pairs of grid side rods I0. The center distances of the notches 35 is the same as the normal center distances of the grid side rods. The segment 33 'also has openings or notches 36 to receive the mounting side rods 28. The openings or notches 35 and'36 are formed entirely in the segment `33. The 'segment '33 has a central opening or notch3I, co-acting with a smaller central opening or notch 38, formed in the segment 34, to receive the upper end of the cathode sleeve I2.

The numeral 39 designates a lower insulating disc, formed of mica or the like, and this disc is cut generally diametrically to provide a segment 48 and a segment 4I, the segment 40 being slightly larger than lthe segment 4 I The ,segment 48 is provided with pairs Yof reduced openings or notches 42, having the same center distances as the normal centerdistances of the pairs of grid side rods I8 and of sufficient size to snugly receive the reduced portions Illa of the grid side rods. The segment 43 is provided with openings or notches 43 to Vreceive the mounting side rods 28 and is also provided with a central opening or notch i44 co-acting with an opening or notch 45 to receive the lower end of the cathode sleeve I2. The openings or notches 42 and 43 are formed entirely in the segment 40.

Thenumeral "46 designates a spacer shield, preferably formed of metal and arranged upon the top of the disc 32 and having a depending annular flange 4'1. Portions of this annular flange are crimped inwardly and upwardly to form stops 48, engaging the inner face of the disc 33, as shown. `A metal spacer shield 49 vis arranged uponthe Vlower ,face of the disc 48 and has an yannular 'ange 50, portions of which are crimped inwardly and downwardly, 'to form vstops 5I, engagingthe inner face of the ldisc '48. The upper spacer shield 46 is provided with extensions 52, welded to the mounting side rods 28, while the lower spacer shield 49 Yis provided with extensions 52, welded to themounting siderods. The spacer shields are insulated from the grid side rods.

In assemibling the grid device, the segments 33 and 40 maybe held vertically ori-edge with their notches uppermost. rIhe assembled grid units and cathode sleeve are brought in proximity to the segments 33 and 40, and corresponding ends of `the grid side rods II] are placed in the notches 35 and the corresponding end of the cathode sleeve in the notch '37, while the .reduced portions Il)a of the side rods are inserted intothe notches42 .and the adjacent end of the sleeve I2 into the notch '144. 1VIn a similar manner themountingside rods28 are varranged Within the notches' 36 and 43.` The shield 49may now be applied to the segment 40 and the flange ilcrimped toprovidethe stops- I. l.'Ihesegment '4l may now be inserted'inplace within the ilange 50 and will cover the several notches, and J in the annular flange 41 and coversithenotches ofl the segment 33 `and is locked to theshield by the formation of the stops 118. .ThgeXtensions 52 are now weldedto the mounting side `rods 28. i The invention isnot restricted to thisl precisemanner of assembling. f It` isathus .seen.that the notches" I0 rreceive portions yof the segment 40 adjacentfto theopenvings 42 l'and' the walls `of the notches |l|'-hold the` side rods against axial movement and the walls of the openings42 hold the grid side rods againstradialgdisplacement while the segment .4I holds. them against displacementat a,right angle to thisradial-movement. j

While the grid side rods are securely held or locked to thelower disc 39 against axial and lateral displacement, their upper ends are securely held in the openings or notches against lateral displacement, but may slide therein, due to expansion and contraction. The segment 33 is in the plane of the segmentI 34 and the segment is in the plane of the segment 4 I.

In each form of the invention, the grid wires Il are in the form of spiral turns. This form of grid element has been shown for the purpose of illustration and other forms of grid elements may be used. While I have shown two grid units for the purpose of illustration, any number may beused.

The present application is a continuation in part of my application Grid device, filed July 3, 1943, Serial No. 493,459, allowed August 21, 1943.

It is to be understood that the forms of my invention herewith shown and described are to be taken as preferred examples of same, and that various changes in the shape, size, and arrangement of parts may be resulted to without departing from the spirit of my invention or the scope of the subioined claims.

Having thus described my invention, I claim:

1. A grid device for radio tubes or the like, said device comprising spaced grid side rods having a normal center distance and provided with notches, a grid element carried by the side rods, and insulating discs having openings to receive the side rods, the openings of one disc having a different center distance than the normal center distance of the side rods so that the notches in the side rods may receive portions of such disc.

2. A grid device for a radio tube or the like, said device comprising spaced grid side rods having a normal center distance and provided with notches, a grid element carried by the side rods, and insulating discs having openings to receive the side rods, the openings of one disc having a smaller center distance than the normal center distance of the side rods, the arrangement being such that the side rods are shifted inwardly so that they may enter the last named openings and then return to the normal center distance so that their notches receive portions of the disc adjacent to the last named openings, and means to hold the side rods so that their center distance can not be changed with relation to the last named openings.

- 3. A grid device for a radio tube or rthedike. said device comprisingspaced grid side rods'havin'g a' normal center distance and provided with notches, a grid element carried by theside rods, insulating discs having. openingsto receive :the side rods,the openings of one disc` having a smaller center distance than the normal center 4distance of the siderods, the arrangement being -such thatv the side rods areshifted inwardly .so that they mayv enter the last named openings and lthen return to the normal center distance so lthat their -notchesy receivev portions of the disc adjacent tothe lastnamed openings, the stiffness of the. grid elementthenholding the side rods in the normal center distance. l

4. A grid device for a radio tube or the like, said grid device comprising spaced grid side rods having ,a normal ycenter distance, and provided with notches, an insulating dise having openings to receive the grid side rods,` the openings having avdiierent vcenter,distance than the side rods, the notches receivingportions of the disc adjacent Ato,t lie openings, and a second insulating disc disposed upon one sideof thefirst, nameddisc ,and having` openings toreceive the side rods. 5. A'grid device for a radio tube or'the like, said grid device comprising spaced grid side rods having a normal center distance, and provided with notches, an insulating disc having openings to receive the grid side rods, the openings having a different center distance than the side rods, the notches receiving portions of the disc adjacent to the openings, a second insulating disc disposed upon one side of the first named disc and having opening to receive the side rods, the center distance of the last named opening being the same as the normal center distance of the side rods, and means to hold the first and second named discs together.

6. A grid device for a radio tube or the like, said device comprising a plurality of spaced grid side rods having a normal center distance and provided with notches, grid means carried by the side rods, an insulating disc having openings to receive the side rods, the openings having a different center distance than the side rods, the notches receiving portions of the disc adjacent to the openings, means to hold the side rods so that their center distance can not be changed with relation to the openings, a second insulating disc having openings to receive the side rods, and means to support the rst and second named discs. 7. A grid device for a radio tube or the like, said grid device comprising spaced side rods having a normal center distance and provided with notches, grid means carried by the side rods, an insulating disc having openings, the openings having a diierent center distance than the side rods, the notches receiving portions of the disc adjacent to the openings, a second insulating disc disposed upon one side of the rst named disc and having openings which have a center distance substantially the same as the normal center distance of the side rods, a shield for securing the discs together, a third insulating disc having openings to receive the side rods and having the same center distance as the side rods, a shield secured to the last named disc, and means to support the shields.

8. A grid device for a radio tube or the like, said device comprising a side rod having a notch, a grid element carried by the side rod, an insulating member having an opening to receive the side rod, the notch receiving a portion of the insulating member adjacent to the opening, the lside rod beinglocked to the insulating member against relative axial movement, and, means .to hold the side rodl against lateral movement with -relation to theinsulating membeng; t 9. A grid device for a' radio tube or the like, said grid device comprising a side rod having a notch, a grid element carried by the side rod, an insulating disc having an opening to receive the side rod, the notch receiving a portion of the disc adjacent to the opening. n.

10. In a grid device for-a radio tube or the like, a side rod having a notch, a grid element carried by the side rod,l and an insulating disc arranged adjacent to the side rod, the notch receiving a portion of the disc. 'f Y l1. A grid device for a Vradio tube or the like, said device comprising `spaced side rods having notches, grid means secured t'o the side rods, an insulating disc having openings to receive the side rods, the notches receiving portions of the disc adjacent to the openings, the lside rods being locked to the disc against relative axial movement, a second insulating disc spaced from the rst named disc and having openings to slideably receive the side rods, and means to support the I discs.

12. In a grid device for a radio tube or thelike, spaced grid side rods having notches providing reduced portions, grid means carried by the side rods, Aan insulating member having lreduced notches to receive the reduced portions and Ahold the side rods against displacement, the notches yof the side rods receiving portions of the insulating member to hold the siderods against axial displacement with relation to the insulating member, and means to hold the reduced portions with- 

